I can't tell from the pictures whether or not the ON key is lowered with respect to the others. But I'm sure that the calculator includes a large ENTER key and a raised edge around the keyboard. The first is obvious from the photos, and the second is mentioned in the sales flyer.

If anyone has an active link to the picture of Cyrille deBrebisson's baby "using" an HP-35s, s/he may put to rest the 'Lowered ON key' question.

Assuming Gene is participating in a "Hype the 35s ahead of its imminent release" campaign (not that there's anything wrong with that, if he is), I suspect the answer is "D". (Why call attention to any negative aspects of the new calc, however insignificant?)

If you interpret Gene's post strictly, a 'returning' feature would be one that has been absent in say the last three generations (or series) of HP calculators. (ie. the blue 49g, gold49g+, black 50g, 33s, 30s, etc.)

Even the 32sii, and 42s are "recent" in the eyes of some of our members...and both these machines had raised keyboard rims, large keys, and lowered ON keys.

Assuming you draw the datum plane at these machines, later machines have all been absent of the large ENTER key, and raised keyboard rim.